Lifting-jack



G. W. MEYER AND C. A. R008.

LIFTING JACK.

APPLlCATlON FILED SEPT. 27. 1920.

1 ,3 95 ,650. Patented Nov. 1, 1921.

66 M. izm m UNITED STATES PATENT OFFICE.

GEORGE W. MEYER AND CHARLES 'A. RO OS, OF CINCINNATI, OHIO.

LIFTING-JACK.

Specification of Letters Patent.

Patented Nov. 1, 1921.

To all whom it may concern:

Be it known that GEORGE W. MEYER and CHARLES A. Roos, citizens of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful Improvements in Lifting-o acks, of which the following is a specification.

Our invention relates to the class of implements commonly known as lifting jacks; its object being to provide a jack adapted to operate not only upon the ground or similar support, but upon a post or equivalent ele ment such as the relatively fixed or basic member of an extensible shore, to elevate the adjustable member upon and in relation to said post.

To this end our invention consists in a jack provided with means for adjustable self-support upon a relatively fixed post and thereby to act upon an extensible element employed in connection therewith. Vhile especially useful in extensible shores, other uses will readily suggest themselves.

In the drawings herewith submitted illustrative of the specification:

Figures 1 and 2 are vertical elevations in cross planes of alifting jack of common type embodying our invention; and

Fig. 3 is a plan view of the structure as seen from above.

Referring now to the drawings, A designates the supporting body or frame of a lifting jack of the central screw type, provided with the combined ratchet wheel and bevel gear B, the bevel pinion 5 operating screw C,

and minor adjuncts such as handle 6 ratchet pawl 6 etc., all as found in lifting jacks in common use in automobile service, etc., and require no further description.

In carrying out our invention, we provide the containing frame A with a side lug D perforated horizontally from side to side to admit a pivot stud or bolt f on which is carried a holding plate E formed or provided with side ears (2 extending downwardly at opposite sides of the lug D and having perforations registering with that of the lug 1) to admit and seat the stud or bolt f, in such wise as to permit a slight pivotal action by the plate E The plate E as shown in the illustration, extends outwardly and is formed with a U- shaped side opening to admit and seat the plate horizontally on a post or tubular ele- 'provide, in addition to ment P upon which it is adjustable by manipulation of the plate as canting lock by a slight pivotal movement out of the horizontal as indicated in Fig. 1 of the drawing, and is thus susceptible of a following up adjustment to engage at any elevation on the post P limited only by the general conditions of adjustability of the parts concerned.

In order to keep the implement in proper longitudinal relations with the post P, we the plate E which prevents displacement only at the open side, a similar plate E fixedly secured at the bottom of the jack frame A, having an opening registering with but opening outwardly at a rlght angle with that of plate E Plates with larger or smaller openings and conformably shaped, may be substituted according to requirements of use.

The jack by its weight, especially when increased by the load carried thereby, causes the plate E by its pivotal action to assume a canting relation to the post P, thereby causing the upper and lower edges or curbs of the perforation in plate E to seat firmly against the post at opposite sides as clamping elements moving toward each other; producing a holding force increased by relatively downward pressure on the jack.

By lifting the jack or slightly depressing the outer side of the plate E into a horizontal position in relation to the post, the position of the jack may be re-adjusted to a higher or lower point as desired.

We claim as our invention and desire to secure by Letters Patent of the United States g 1. In combination with a telescopic lifting jack, a perforated canting plate pivotally secured at one side to the frame of the ack and adapted to embrace and engage a supporting post at opposite sides at right angles with the the line of its pivot in a canting relation of contact with the opposite edges or curbs of the plate perforation.

2. A telescopic lifting jack provided with a side lug and a plate pivotally secured thereto, having a side recess adapting it to engage the ack removably upon apost or upright and assume a canting or clamping relation of engagement therewith, at opposite sides of the post, thereby supporting the jack as a basis for its own lifting action.

3. In a telescopic lifting jack of the character indicated, a laterally extended plate having a'U-shaped opening outwardly at a In testimony whereof we have hereunto set 10 7 right angle with the general line of extenour-hands in presence of two subscribing slon, and a second plate spaced apart from witnesses.v

the first, with a similar opening extended outwardly at a right angle with that of the first plate whereby the jack may be manually v placed upon or removed from a basic sup- 'Witnesses:

port and held .in parallel relations of engage- NORMA D. BERGER,

ment therewith while being operated. V LEWIS M. HosnAi 

